This page presents some ideas for expressing NDVI in terms of population density for the City of Denver, Colorado.
A map of population density by block group per 2016-2020 American Community Survey 5-year Estimates
Population density tertiles
A map of NDVI of each block group. Note NDVI is measured using Landsat-8 at a spatial resolution of 30 meters squared on July 4, 2021, a cloud-free day. The weighted average NDVI of each block group excludes bodies of water.
NDVI tertiles, overall




The first is somewhat difficult to visualize on a map because the distribution has a right skew with some very high values and most much lower.
## Min. 1st Qu. Median Mean 3rd Qu. Max. NA's
## 457.5 14482.2 22057.3 35548.7 36465.0 364573.0 8

The second is easier to visualize because the distribution is uniform by definition (a simple rank).
## Min. 1st Qu. Median Mean 3rd Qu. Max. NA's
## 1.0 131.5 262.0 262.0 392.5 523.0 8

Map population density per NDVI and the ranking of population density per NDVI on the same map.
Copyright © 2022 Michael D. Garber